Button 从对话框布局中消失

Question

为什么 button 不能在对话框窗口中显示出来？

  Dialog d = new Dialog(AddContact.this);

    LayoutInflater li = (LayoutInflater) getSystemService(Service.LAYOUT_INFLATER_SERVICE);
    ViewGroup contentView = (ViewGroup) li.inflate(R.layout.dialog,null);

    d.setContentView(contentView);
    d.setTitle("Please correct these errors:");

    TextView error = (TextView) contentView.findViewById(R.id.textView1);
    Button closer = (Button) contentView.findViewById(R.id.button1);

    closer.setText("Close");
    error.setText(errorMessage);
    d.show();

dialog.xml layout 文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent" android:layout_height="wrap_content"
    android:orientation="vertical" android:padding="5dp">
       <TextView android:text="TextView" android:id="@+id/textView1"
        android:layout_height="fill_parent" android:layout_width="fill_parent" />
    <Button android:text="Button" android:id="@+id/button1"
        android:layout_width="wrap_content" android:layout_height="wrap_content"
        android:gravity="center" />
    </LinearLayout>

Answer 1

使用下面的代码：
只更换 dialog.xml layout 文件中的 Textview

<TextView android:text="TextView" android:id="@+id/textView1"
        android:layout_height="wrap_content" android:layout_width="fill_parent" />